Exemplo n.º 1
0
        // 创建 UPDATE 命令
        protected override DbCommandDefinition ParseUpdateCommand <T>(DbQueryableInfo_Update <T> uQuery, List <IDbDataParameter> parameters = null)
        {
            ISqlBuilder builder     = this.CreateSqlBuilder(parameters);
            var         typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo <T>();

            builder.Append("UPDATE ");
            builder.AppendMember(typeRuntime.TableName, !typeRuntime.IsTemporary);
            builder.Append(" t0 SET");
            builder.AppendNewLine();

            if (uQuery.Entity != null)
            {
                object      entity       = uQuery.Entity;
                ISqlBuilder whereBuilder = this.CreateSqlBuilder(builder.Parameters);
                bool        useKey       = false;
                int         length       = 0;


                foreach (var kv in typeRuntime.Invokers)
                {
                    MemberInvokerBase invoker = kv.Value;
                    var column = invoker.Column;
                    if (column != null && column.IsIdentity)
                    {
                        goto gotoLabel;                                      // fix issue# 自增列同时又是主键
                    }
                    if (column != null && column.NoMapped)
                    {
                        continue;
                    }
                    if (invoker.ForeignKey != null)
                    {
                        continue;
                    }
                    if (invoker.Member.MemberType == System.Reflection.MemberTypes.Method)
                    {
                        continue;
                    }

                    builder.AppendMember(invoker.Member.Name);
                    builder.Append(" = ");

gotoLabel:

                    if (column == null || !column.IsIdentity)
                    {
                        var value = invoker.Invoke(entity);
                        var seg   = builder.GetSqlValueWidthDefault(value, column);

                        builder.Append(seg);
                        length = builder.Length;
                        builder.Append(',');
                        builder.AppendNewLine();
                    }

                    if (column != null && column.IsKey)
                    {
                        useKey = true;
                    }
                }

                if (!useKey)
                {
                    throw new XFrameworkException("Update<T>(T value) require T must have key column.");
                }


                // ORACLE 需要注意参数顺序问题
                int index = -1;
                foreach (var kv in typeRuntime.KeyInvokers)
                {
                    MemberInvokerBase invoker = kv.Value;
                    var column = invoker.Column;
                    var value  = invoker.Invoke(entity);
                    var seg    = builder.GetSqlValueWidthDefault(value, column);
                    index += 1;

                    whereBuilder.AppendMember(invoker.Member.Name);
                    whereBuilder.Append(" = ");
                    whereBuilder.Append(seg);
                    if (index < typeRuntime.KeyInvokers.Count - 1)
                    {
                        whereBuilder.Append(" AND ");
                    }
                }

                builder.Length = length;
                builder.AppendNewLine();
                builder.Append("WHERE ");
                builder.Append(whereBuilder);
            }
            else if (uQuery.Expression != null)
            {
                TableAliasCache       aliases = this.PrepareAlias <T>(uQuery.SelectInfo);
                ExpressionVisitorBase visitor = null;
                visitor = new OracleUpdateExpressionVisitor(this, aliases, uQuery.Expression);
                visitor.Write(builder);

                var cmd2 = new OracleDeleteDbCommandDefinition(this, aliases, builder.Parameters);
                cmd2.HaveListNavigation = uQuery.SelectInfo.HaveListNavigation;

                var visitor0 = new OracleJoinExpressionVisitor(this, aliases, uQuery.SelectInfo.Join, uQuery.SelectInfo.Where);
                visitor0.Write(cmd2);

                var visitor1 = new OracleWhereExpressionVisitor(this, aliases, uQuery.SelectInfo.Where);
                visitor1.Write(cmd2.WhereFragment);
                cmd2.AddNavMembers(visitor1.NavMembers);
                builder.Append(cmd2.CommandText);
            }

            builder.Append(';');
            return(new DbCommandDefinition(builder.ToString(), builder.Parameters, System.Data.CommandType.Text));
        }